Biker is a Trainer Class introduced in Generation I. They are rowdy young men riding "bikes", although they appear to be motorcycles. In Generation I to III, they are depicted as skinny young men riding a motorcycle but by Generation IV, they have been buffed up as tougher and larger Bikers. They are commonly found hanging out with Roughnecks. Some Roughnecks and Bikers come together to form a tag-battling pair known as the Hooligans.
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In PMBW01, a biker called the Bousouzoku (Biker) King challenged Monta and Cheren to a battle, 1 vs 2. He sends out his Braviary to battle. Though Braviary damaged Monta's Snivy and Cheren's Tepig a lot, they use an Oran Berry to help their Pokémon heal themselves. Monta and Cheren tell their Pokémon to use a Combination Technique on Braviary and it fainted as a result.
- A Biker in Pokémon Black and White challenges you to a triple battle.
- In Japanese, they are called Gangsters, Wild-riding Gang or Bousouzoku.